The wicked Cat Man shrinks Shaggy, Scooby and Scrappy to mouse-size; the gang wreak havoc at a circus performance; Scooby and the gang dodge airplanes and skyscrapers as they ride on a runaway hang glider.
Shaggy, Scooby and Scrappy investigate thieves disguised as waiters; Shaggy and Scooby guard a rare comic book, but a creature steals it; Yabba-Doo and Scrappy help Dusty recapture a vengeful escaped prisoner.
Scooby saves the world from an evil alien; a mysterious gypsy attempts to obtain Scooby and Scrappy's tails for her magic potion; the friends have historical dreams when they are locked in a museum overnight.
A mysterious potion transforms Scooby into a werewolf; an evil woman plans to rob a city treasury from beneath the street; Horrible Homer threatens to destroy Tumbleweed unless the town provides him a with a bride.
Merlin the Magician proclaims Scrappy King of England after he pulls a magical sword from a rock. Also: Shaggy, Scooby and Scrappy contend with a mischievous leprechaun and a menacing banshee; and later, they battle sea creatures and an evil centaur.
A vampire-like foreman terrorizes the gang as they construct a building; the gang compete in an air show against an evil baron; the gang work for a scientist whose experiments transform him into a werewolf.
While working as gardeners, Scooby and friends confront man-eating plants. Also: Shaggy, Scooby and Scrappy find themselves in a toy shop of the future; and aliens who look like Scrappy invade a punk-rock contest.